Important Synonyms Starting with O

🔹 Word → Synonyms

Obey – follow, comply, submit, conform

Object – article, item, thing, entity

Objective – aim, goal, target, purpose

Oblige – compel, require, force, bind

Obnoxious – offensive, unpleasant, repulsive, nasty

Observe – watch, notice, perceive, remark

Obstacle – barrier, hindrance, obstruction, impediment

Obtain – get, acquire, receive, procure

Obvious – clear, evident, apparent, plain

Occasion – event, happening, affair, moment

Occupation – job, profession, career, vocation

Occur – happen, take place, arise, transpire

Offence – crime, violation, wrongdoing, sin

Offer – present, propose, suggest, tender

Official – formal, authorized, approved, sanctioned

Often – frequently, repeatedly, regularly, habitually

Old – aged, ancient, elderly, antique

Omen – sign, token, prophecy, indication

Important Synonyms Starting with O

Omnipotent – almighty, supreme, all-powerful, mighty

Open – unlock, uncover, expose, reveal

Oppose – resist, confront, contradict, withstand

Opposite – contrary, reverse, conflicting, different

Opportunity – chance, prospect, opening, occasion

Oppress – persecute, suppress, dominate, tyrannize

Optimistic – hopeful, positive, confident, cheerful

Optional – voluntary, elective, discretionary, not compulsory

Oral – spoken, verbal, vocal, uttered

Order – command, directive, instruction, decree

Ordinary – common, usual, regular, normal

Organize – arrange, systematize, coordinate, manage

Origin – source, beginning, root, foundation

Original – genuine, authentic, innovative, novel

Outbreak – eruption, explosion, epidemic, sudden occurrence

Outcome – result, consequence, effect, aftermath

Outcry – protest, objection, uproar, clamor

Outlook – perspective, view, attitude, approach

Outstanding – excellent, remarkable, exceptional, distinguished

Important Synonyms Starting with O

Outward – external, exterior, outside, superficial

Overcome – defeat, conquer, overpower, prevail

Overlook – ignore, neglect, disregard, miss

Overpower – overwhelm, subdue, crush, defeat

Overtake – surpass, exceed, outdo, outstrip

Overthrow – topple, remove, depose, defeat

Overwhelm – overpower, crush, overcome, stun

Oath – vow, pledge, promise, affirmation

Obese – fat, overweight, bulky, corpulent

Obliterate – destroy, wipe out, annihilate, erase

Obscure – unclear, vague, hidden, ambiguous

Observation – remark, comment, scrutiny, watch

Obsess – preoccupy, engross, consume, dominate

Obsolete – outdated, old-fashioned, antiquated, archaic

Obstruct – block, hinder, impede, prevent

Obtainable – available, accessible, achievable, reachable

Occupation (military) – invasion, conquest, seizure, takeover

Occasional – infrequent, rare, irregular, sporadic

Ocean – sea, deep, waters, marine expanse

Offend – insult, hurt, irritate, provoke

Offering – gift, donation, contribution, sacrifice

Offspring – children, progeny, descendants, heirs

Omit – skip, exclude, neglect, leave out

Onset – beginning, start, commencement, initiation

Opaque – unclear, obscure, murky, non-transparent

Operate – work, function, run, control

Important Synonyms Starting with O

Opinion – view, belief, thought, judgment

Opponent – adversary, rival, competitor, challenger

Opportune – timely, convenient, appropriate, suitable

Oppressive – harsh, cruel, severe, tyrannical

Opt – choose, select, decide, pick

Option – choice, alternative, selection, preference

Ordeal – trial, test, hardship, difficulty

Orderly – neat, tidy, disciplined, organized

Organism – creature, living being, entity, body

Originality – uniqueness, creativity, innovation, freshness

Outburst – eruption, explosion, expression, release

Outdoor – outside, open-air, external, exterior

Outer – external, outward, exterior, superficial

Outlaw – criminal, bandit, fugitive, gangster

Outline – sketch, plan, draft, summary

Outrage – fury, anger, indignation, wrath

Outstanding debt – unpaid, due, pending, arrears

Outshine – surpass, outdo, excel, eclipse

Outspoken – frank, candid, blunt, straightforward

Outstretch – extend, expand, spread, reach

Overact – exaggerate, overdo, dramatize, overplay

Overestimate – exaggerate, overvalue, magnify, inflate

Overjoyed – delighted, ecstatic, elated, thrilled

Overload – burden, overwhelm, saturate, clog

Overlooked – ignored, unnoticed, disregarded, omitted

Overprotective – cautious, shielding, defensive, excessive

Overrule – cancel, reject, override, annul

Oversee – supervise, manage, direct, monitor

Overstate – exaggerate, magnify, amplify, inflate

Overtime – extra hours, additional work, extension

Overwrought – agitated, nervous, tense, excited

Important Synonyms Starting with O

Ovation – applause, cheer, clapping, praise

Overconfident – arrogant, boastful, presumptuous, conceited

Overindulge – spoil, pamper, gratify, coddle

Overweight – fat, bulky, heavy, plump

Overzealous – fanatical, extreme, excessive, passionate

Overhaul – repair, renovate, rebuild, restore

Important Synonyms Starting with N